Multiple flame nozzle



Nov. 28, 1939. R. J. KEHL I MULTIPLE FLAME NOZZLE 0riginal Filed Aug. 10, 1933 u H M m a ham was M i 7 4/ wfwm x I I INYENTOR B05527 JKEHL ATTORNEY Patented Nov. 28, 1939 UNITED "STATES,

PATENT/OFFICE v 2','1-s1,135 MULTIP E FLAME NozzLn .Robert J. Kehl,"Manhasset, N. Y., assignor, by

mesne assignmentsrto Union Carbide and Carbon Corporation', a corporation of New Y ork Application August 10, 1933, Serial N... 684,47 8- Renewed June 11, 1938 9' Claims. (01. 158-414) This invention relates to blowpipe nozzles and T has particular reference to nozzles for cutting, deseaming or welding metals.

' Heretofore, one-piece. and two-piece nozzles have-been employed with oxyacetylene blowpipes' for delivering gases to perform cutting; deseaming and welding operations on metals. In make ing the one-piece nozzles thenumber of rejects is considerable because it is quite 'diflicult to accurately drill each ofthe-small outlet orifice passages to exactly meet the larger gas supply passages which are drilled lengthwise of the nozzle from its rear end to within a short distance from the outlet end of the nozzle. In the two-piece nozzles, an inner tubular part is .usu-

, ally fitted within an outer shell which has in-,

clined outlet orifices at the lower end, and to these: orifices is delivered a mixture of fuel and oxidiz ing gases through an annular chamber formed between the inner part and the shell. With this type of construction it is necessary to perform a number of machining operations which make the completed two-piece nozzle relatively expensive to manufacture. Furthermore, it is. practically.

impossible to maintain efilcient heat transfer be;

tween the respective parts of multi -pieceto'fh this due to the light film ofoxide that is always present on their contacting surfaces. Due to this following description-taken with the accompanying, in which:

Fig. l of the drawing is a longitudinal cross-sectional view of a. blowpipe nozzle illustrating one embodiment ofthis invention;

Fig. 2 is a plan-view-oi the outlet end of the nozzle shown in Fig. .1; and

Fig. -3 shows-a cross-sectional view of a por-. tionfof another blowpipe nozzle embodying this invention.

Fig. 1 illustrates a unitary multiple flame nozzle embodying this invention which is especially adapted for operations suchas cutting and deseaming metals. The cylindrical body In of this nozzle may be made from a rod of metal such as copper, and adjacent one end isprovided with suitable means, such as the threads ll, whereby the nozzle maybe secured to a blowpipe head adapted to supply appropriate gases, such as oxygen and a mixture of oxygen and acetylene, to 5 the nozzle passages. At a short distanceyback from its other end, the body 10 may be machined to provide a circumferential channel or groove l2 of substantial depth and width. A passage I3 I of suitable diameter may extend centrally through l0 the body ID to supply oxygen to the work, and I one or more (4 equally spaced, in this instance) combustible mixture passages Il may be drilled from .therear end .of the body parallel to the passageQl3 and throughthe'rear wall I5 of the,

groove l2.

The annular front wall of the groove i2 is preferably inclined forwardly and outwardly from the bottom surface IT. The width of the groove l2 and'the inclination of the wall I6 are desirably such that a series (4111 this instance) of equally spaced outlet passages or orifices of relatively small diameter may be provided by drilling through th ersection IQ of the body-between the .grevlrandthe front face 20. 'The passages I8 5 may be drilled rearwa'rdly from the front face '20 of the groove, or by inserting the drill-or drills from the side into the groove 12 and drilling forwardly to the face 20; and by the. last-mentioned procedure, the entrances of the passages l8 may 3o be. countersunk to form a tapered inlet .as at 2|,-

if desired,lto aid in producing fully formed gas 3 flame Jets issuing from the oriflces of these passages. I v

As shown, the passages l8 are normal to the. surface I6 and-so inclined relatively tofone another that, if extended, theiraxes would converge substantially at a point on the extended longi tudinal. axisof the nozzle and at a short di tan e in front of the face 20. However, the inclination of the passages I8 may be varied as desired to therfrom the face 20. r The open side of the groove l2'maybe closed and sealed gas-tight by suitable means, such as '45 the metal sleeve 22, which desirably'tightly fits and is silver soldered or otherwise secured to the circumferential machined portions "Hand 24 of r the body and the end section l9. The machined portion 23 forms a peripheral shoulder 23' with a portion of the body I'll. behind the front face 20 and the rear end of the sleeve abuts against the shoulder 23 to accurately position said sleeve relative to the front. face 20 of the nozzle and to locate-the point of convergence closer to or farresist rearward thrusts against the sleeve and u placement of said sleeve and the wear-resistant layer thereon when the nozzle rubs against a workpiece. The depth. of machining and the thickness of the sleeve are desirably thesame so that the outside of the nozzle will present a. smooth finished cylindrical. surface of uniform diameter. The machiningon the body section I9 may be inclined as at 25 andthe front end of the sleeve may be shaped or bent-inwardly against the surface 25 to eliminate a sharp corner at the front end of the nozzle; and the outer surface of the inturned end of the sleeve may be covered with a layer of wear-resistant metal forming a composite metal ring including said wear-re-' sistant metal and the metal of sleeve 22, to further protect the corner of the nozzle and reduce the wear at the periphery of its front face when the same rubs against the work when in use. Metal such as that disclosed and claimed in United States Patent 1,057,423 to Elwood Haynes has been found to be particularly suitable for this purpose because it is highly resistant to wear even at temperatures near the ignition temperature of steel. This annular layer of wear-resistant material encircling the nozzle body adjacent but behind the front face of the nozzle provides a work-contactingportion'of such material irrespective of the final rotative position the nozzle may assume when it is firmly coupled to a blowpipe head.

The sleeve 22 and the walls of the groove I! together provide an annular chamber C within the unitary nozzle, whichchamber receives the gaseous preheating mixture from the inlet passages l4 and uniformly distributes this mixture to'the passages l8. The entrances to the passages It may be directly opposite the discharge ends of the passages '14 or they may be offset radially or angularly, as desired; but in any event the intermediate chamber C serves to evenly distribute the gas to the passages l8 and thus produces flame jets of uniform intensity.

In some types of blowpipe nozzles embodying this invention the central passage l3 may be omitted, or this passage may be employed in a welding nozzle as a guideway for feeding a welding rod to the work to be welded. A construction of the latter type is illustrated in Fig. 3 in which the central passage I3 is designed to guide a welding rod R to the work. Here, the flames produced by the gas jets issuing from the pas- 1 sages l8 may impinge against and preheat the rod R. before it is melted by a welding flame and deposited upon the work. Otherwise the construction and operation of the nozzle shown .in Fig. 3 is substantially the same as the one shown in Figs. 1 and 2, except that the sleeve 22 shown 2 in Fig, 3 is somewhat shorter than the sleeve 22 and is not fitted into machined portions of the body II! but is simply soldered gas-tightly t0 the latter over the groove therein.

It will be seen that the present invention provides an improved unitary blowpipe nozzle which is comparatively easy and inexpensive to manufacture, and in which the converging drillings forming the small mixture outlets may be inclined at almost any desired angle to the nozzle axis and still not present themanufacturing difiiculties heretofore encountered in drilling these small passages to exactly meet thosepassages drilled part way through the nozzle body from its other end.

Although certain embodiments of the improved nozzle have been shown and described in detail,

. groove andsecured' to said body.

thereby assists in preventing the rearward disit will be understood that various changes may 1 be, made without departing from the principlesof this invention. I

I claim: v

1. A blowpipe' nozzle comprising zle body having angularly related gasinlet and gas'outlet passages drilled therein, and achamber between said inlet and outlet passages, said chamber comprising a circumferential" groove formed in said body and a sleeve covering said 2. A blowpipe nozzle comprising the combination of a metallic body having a central passage therethrough'and an annular groove at the lower end thereof, said-groove having a lower surface disposed at an angle to theaxis of the central passage of said body, a plurality of drilled passages thereinparallel to and surrounding said central passage and connected with said groove,

said sleeve being permanently secured to said body.

discharge end of the nozzle, the front wall of said groove being inclined outwardly and forwardly; said body having a fluid inlet passage .drilled a unitary noz- 3. A nozzle comprising a unitary body having a circumferential groove formed therein near the therein and extending longitudinally thereof and I openinginto said groove; said body also having a fluid discharge passage drilled threin and having its inlet in said front wall and it outlet at the discharge end of said nozzle, said discharge passage having its axis inclined forwardly and inwardly toward the. main axis of said body; and a sleeve fluid-tightly secured to said body and constituting a circumferential outer closing wall for v said groove.

4. A nozzle as claimed in claim 3, in which the inlet of said discharge'passage is tapered.

5. A blowpipe nozzle comprising a unitary body having a circumferential groove formed therein near the discharge end of the nozzle, the front wall of said groove being inclined outwardly and forwardly; said body having a passage extending axially therethrough; said body also having another passage drilled in and extending longitu dinally thereof and opening into said groove; said body further having a third passage drilled therein and communicating with said groove and having its outlet at the discharge end of said nozzle, said third passage having its axis inclined forwardly and inwardly toward the axis'of the firstmentioned passage; and a sleeve gas-tightly secured to said body and constituting a circumferential outer closing wall for said groove.

6. A nozzle comprising a unitary body having a circumferential groove formed therein near the lower end of the nozzle; said body having a fluid inlet passage drilled therein and extending longitudinally of said body and opening into said groove; said body also having a fluid discharge least the lower end of said sleeve at-the point of its attachment to said body comptisingadayer of wear-resistant metal.

7. A blowpipe nozzle comprising a metal nozzle body having gas passages extending therethrough and provided with gas outlets in the front face of said body; a metal sleeve secured to said bodyand surrounding said body behind but adjacent said front face; and an annularlprotective layer of wear-resistant metal permanently united to the outer surface of said sleeve and covering at least the annular portion of said surface adjacent but behind the periphery of said front face, both said sleeve and said protective layer being independent of and spaced outwardly from said gas outlets, said protective layer being more resistant to wear than saidbody and said sleeve to reduce wear adjacent and behind the periphery of said front face when said periphery rubs against the work during the use of said nozzle.

8. A blowpipe nozzle comprising a metal body having gas passages extending therethrough and at gas outlets in the front face of terminating said body, said body also having a peripheral shoulder behind said front face; and a composite metal ring extending circumferentially of. said body behind said'front face and secured to-said body in abutting relation to said shoulder, said composite ring comprising a metal sleeve and an annular protective layer of wear-resistant metal permanently united to the outer surface of said sleeve and covering at least the annular portion of said surface adjacent but behind the periphery of said front face, both said sleeve and said protective layer being independent of and spaced "outwardly. from said gas outlets,

bustible therethrough, all of said passages terminating at having apircumferentiaI a shoulder, both behindsaidfront face; and a 5 bearing outlets-in the front face ofsaid body, said body machined, portion and wear than said blowpipe nozzle comprising an elongated composite metal ring permanently-secured to' said body and extending,circumferentially ofsaid body,

adjacent tobut behind said front face, "said ring comprising an annular metal sleevesecured to said body and having its inner. side bearing against said machined portion and its rear-end against said shoulder, and an annular protective layer of wear-resistant metal (such as an alloy of cobalt, chromium and'tungsten) permanently united to the outer surface of said sleeve and covering at least theannular portion of said surface adjacent but behind the periphery .ao ERrr" KJEHL. 7 

